Question: Which chemical compound has the most binding energy?
Paraphrase: Which chemical mixture has the most unbreakable energy?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q11173 . ?ent wdt:P2154 ?obj } ORDER BY DESC(?obj)LIMIT 5 
Answer: radon-220, radon-219, polonium-210, polonium-207, thallium-205